Well, to be honest, I just don't think something explodes like that. It's too, well, yeh, so, can't seem to find the word... It needs wider impact, and more widened...(as you can see I can't seem to find the words anymore) Do you remember your EZtoon explosion? Like that, but then in proportion of the size like now.
And I don't really think you have just round particles with an explosion, it needs to be more cracked. And maybe some cracks on the ground too, though not necessarily.
(crap comment, I know)